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My 50 is suffering from quote severe torque steer when acceleration sharply. I have been advised that it is a rear suspension issue - either a broken leaf spring or a broken leaf spring center bolt. It is a funny feeling as the car seems to pull sharply left on acceleration and then seems to fall down flat when lifting of the power. It seems dangerous as if it will loose control. What is your opinions? I cannot see anything obviously broken with the car on the ground.

I would have somebody do a thorough undercar inspection.
If nothing appears broken then I would slacken the hand brake, ensure the wheels spin freely and retest. If you have a broken spring shackle mount the rear axle will shift pulling on the hand brake and change the thrust angle.

Usually with a broken center bolt, someone following you can see the car running doglegged.
John

Check also for broken spot welds on the axle banjo cradles where the spring U Bolts sit. They are not very strong and I have broken them on my 38 120 ( with 54-327-R6 fitted). More likely to be be a broken centre bolt as mentioned earlier. PT